Naslov
Numerical simulations of upwelling and downwelling in the Adriatic under the influence of dominant winds

Autori
Međugorac, Iva ; Bubalo, Maja ; Pasarić, Mira ; Pasarić, Zoran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract Book MedGU22 / Ciner, Attila - Marakeš, Maroko, 2022, 12-12

Skup
MedGU22

Mjesto i datum
Marakeš, Maroko, 27.11.2022. - 30.11.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Adriatic Sea, Upwelling, Sirocco, Bora, Etesian

Sažetak
The Adriatic has complex morphology and nonuniform surrounding orography which considerably affect air flow over the basin and its response to forcing. Upwelling/downwelling (U/D) are wind driven phenomena whose distributions are determined by wind-field structures and basin morphology. Over the Adriatic there are three dominant wind regimes, Bora, Sirocco and Etesian, that may persist for several days and therefore induce nonuniformly distributed zones of U/D and consequently affect marine life. Simulations of U/D were performed using SCHISM model forced with average Bora, Sirocco and Etesian over a homogeneous sea. SCHISM (Semi-implicit Cross-scale Hydroscience Integrated System Model) is a semi-implicit finite-element numerical ocean model used for simulations of 3D estuarine and coastal circulation. It is based on 3D shallow water equations, with hydrostatic and Boussinesq approximation, and of salt and heat transport equations. The wind fields were generated with the LAMI model. SCHISM model was set up over the Adriatic with fine resolution (100 m - 2 km) and a radiation boundary condition at the Otranto Strait. Simulations were started from undisturbed sea level and run for several days during which wind was kept constant. U/D was quantified as mean vertical velocities in the upper 40 m on the 5th day of simulations, when steady state was achieved. For all three regimes, upwelling occurs on the leeward side and downwelling on the windward side of islands. The most complex structure occurs for Bora wind with several pronounced areas of U/D: upwelling dominates in the open sea in front of Kvarner Bay, in the middle Adriatic, and along the Albanian coastline ; downwelling dominates along the Italian coastline. These results are in an agreement with the study by Bergamasco and Gačić (1996). For Sirocco, upwelling occurs along the southern Italian coastline and in the open sea at the same locations as for Bora wind, while downwelling occurs mostly close to the Croatian coastline. Etesian wind induces the weakest response, with evident downwelling along the southern coast of Italy. Obtained distributions of upwelling reveal areas in the Adriatic that are, at least in terms of dynamics, favorable for development of phytoplankton blooms. However, whether this will happen depends on biological factors as well. Thus, the obtained U/D distributions need to be compared with SST,

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA